Method of controlling porosity in a composite article
US5238621A · kind A · utility
29Cited by
33References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 26, 1992 |
| Grant date | Aug 24, 1993 |
| Priority date | — |
| Expiry date | Jun 26, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J20/28078
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A composite article comprising, in the unexpanded form, a fibrillated PTFE matrix and a combination of energy expandable hollow polymeric particles and sorptive particles, which composite, on applying energy such as steam, heat, or laser energy, provides an expanded article having increased void volume and decreased density. The expanded articles are porous and efficient articles for separation and purification applications. In flat or rolled form, the composite article can be used in separation devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.